Keywords
upstream Bribin River
digital filtering
How to Cite
Abstract
Baseflow of karst underground river is a dependable flow to recharge the underground flow within dry seasons. This research was conducted in Gilap Cave, located in the upper course of Bribin River. This location has a premeditated point for sustainable karst water along the Bribin River. The main objective of this study was to separate the components of Gilap underground river flow, with the intention on defining the proportion of baseflow component during the period of measurements. A water level data logger was installed during the period between 1 May 2006 and 31 March 2007 to determine the variation of water level during the dry season, rainy season, and when the prevalence of flood events. Subsequently, several times of discharge measurements at the time of high, medium, and low water level were carried out to define stage-discharge rating curve. Then, baseflow separation was conducted using automated baseflow separation by a digital filtering method. A digital filter value was obtained from a constant recession analysis of flood events all over the year, correlated with Maximum Baseflow Indices Value (BFImax) within karst aquifers. The result shows that during one year, 41 flood events occured in the Gilap Cave with digital filtering value of 0.996. In addition, the calculation of baseflow percentage performs that the overall value of the ratio is close to a number of around 80%. Meanwhile, the percentages within flood events vary between the range of 45-75%. From these figures, it generally confirms that flow from small fracture is still dominant to recharge dependable flow within the upper stream of Bribin River, especially in the dry season.
References
Adji, T.N., 2010. Variasi Spasial-Temporal Hidrogeokimia dan Sifat Aliran Untuk Karakterisasi Sistem Kars Dinamis di Sungai Bawah Tanah Bribin, Kabupaten Gunung Kidul, DIY. Disertasi tidak dipublikasikan, Fakultas Geografi, Universitas Gadjah Mada, Yogyakarta.
Balazs, D., 1968. Kars Regions in Indonesia: Karszt-Es Barlangkutatas, V. Budapest, Globus nyomda, 61h.
Bemmelen, R.W. van, 1970. The Geology of Indonesia. General Geology of Indonesia and Adjacent Archipelagoes. Government Printing Office, The Hague.
Bonacci, O., 1990. Regionalization in kars regions. Proceedings of the Ljubljana Symposium, IAHS Publ. no. 191, 1990.
Brunsch,, A., Adji, T.N., Stoffel, D., Ikhwan, M., Oberle, P., dan Nestmann, F., 2011. Hydrological Assessment of a Kars Area in Southern Java with Respect to Climate Phenomena. Proceedings of Asian Trans-Disclipinary Kars Conference, Jogjakarta.
Danes, J.V., 1910. Die Karsphanomene in Goenoeng Sewoe auf Java. Tijdschrift van het konijnklijke Nederlands Aardrijkskundige Genoetschaap, 2( XXVII), h.247-260.
Domenico,P.A. dan Schwartz, F.W., 1990. Physical and Chemical Hydrogeology. 2nd Ed. John Wiley & Sons.
Eckhardt, K., 2005. How to construct recursive digital filters for baseflow separation. Hydrological Processes, 19, h.507-515. DOI:10.1002/hyp.5675
Ford, D. dan Williams, P., 1992. Kars Geomorphology and Hydrology. Chapman and Hall, London.
Gillieson, D., 1996. Caves:Processes, Development, and Management. Blackwell, Oxford. DOI:10.1016/S0277-3791(97)89039-7
Haryono, E., 2001. Nilai Hidrologis Bukit Kars. Prosiding Seminar Nasional Eko-Hidrolik, 28-29 Maret 2001, Jurusan Teknik Sipil , UGM.
Jankowski, J., 2001. Groundwater Environment. Short Course Note, School of Geology, University of New South Wales, Sydney, Australia.
Kusumayudha, S.B., 2005. Hidrogeologi Kars dan Geometri Fraktal di Daerah Gunungsewu. Adicita Karya Nusa, Yogyakarta.
Kusumayudha, S.B., Zen, M.T., Notosiswoyo, S., dan Gautama, R.S., 2000. Fractal Analysis of the Oyo River, Cave Systems, and Topography of the Gunungsewu Kars Area, Central Java, Indonesia. Hydrogeology Journal, 8, h.271-278. DOI:10.1007/s100400050014
Lehmann, H., 1936. Morfologiche Studien auf Java. Gohr, Abhandlungen, 3, Stutgart.
MacDonalds dan Partners. 1984. Greater Yogyakarta - Groundwater Resources Study. 3C: Cave Survey, Yogyakarta. Directorate General of Water Resources Development Project (P2AT).
Nathan, R.J. dan McMahon, T.A., 1990. Evaluation of automated techniques for baseflow and recession analysis. Water Resources Research, 26(7), h.1465-1473. DOI:10.1029/WR026i007p01465
Schulz, E.F., 1976. Problems in Applied Hydrology. Water Resources Publication, Colorado. DOI:10.1177/030913337900300314
Sinar Harapan, 2004. Mesin Bor Pembangunan Bendung Gua Bribin Tiba. 18 Juni 2004. https://www.sinarharapan.co.id/berita/0406/17/nus04.html.
Smart, P.L. dan Hobbes, S.L., 1986. Characteristics of Carbonate Aquifers: A conceptual basis. Proceedings of Environmental Problem in Karst Terrains and Their Solution, Bowling Green, KY: National Well Water Association, h.1-4.
Suara Merdeka, 2004. Warga Gunungkidul Bakal Nikmati Air Bersih, 21 Juni 2004. https://www.suaramerdeka.com/harian/0406/21/ked08.htm.
Surono, Toha, B., Sudarno, I., dan Wiryosujono, S., 1992. Geologi Lembar Surakarta-Giritontro, Jawa, sekala 1:100.000. Pusat Penelitian dan Pengembangan Geologi, Bandung.
Sweeting, M.M., 1972. Kars Landforms. Macmillan, London. DOI:10.1017/S001675680004807X
Waltham, A.C., Smart, P.L., Friederich, H., Eavis, A.J., dan Atkinson, T.C., 1983. The caves of Gunung Sewu, Java. Cave Science, 10(2), h.55-96.
White, W.B., 1988. Geomorphology and Hydrology of Kars Terrain. Oxford University Press, New York. DOI:10.1017/S0016756800006415
White, W.B., 1993. Analysis of Kars Aquifer. In: Alley, W.M. (ed.), Regional Groundwater Quality. Van Nostrand Reinhold, New York.